Sharpening instrument



31, MILLER SHARPENING INSTRUMENT Filed Jan. .21, 1944 Patented July 31, 1945 SHARPENING INSTRUMENT Bernard Mark Miller, Shemeld, England Application January 21, 1944, Serial No. 519,126 In Great Britain December 9, 1943 2 Claims.

This invention relates to sharpening devices. Hitherto it has been customary to sharpen knives such as carving knives on asharpening device known as a steel. This consists of a body member of rod-like shape made of steel provided with a tang fitting into a handle.

This device is, however, unsuitable for .the sharpening of hollow ground carving knives as such carving knives have cutting edges of wafer thickness which are liable to injury when brought into contact with hard steel, and it i an object of the present invention to provide an improved device suitable for sharpening hollow ground carving knives.

With this object in view the present invention provides a sharpening device comprising abody member, preferably of rod-like form, having at least one groove therein filled with a mass containing abrasive material bonded to the surface of the groove, the surface of the said mass being level with or projecting beyond the surface of the body member which is made of material softer than that of the abrasive so that it will wear away as the abrasive wears away.

Preferably a plurality of grooves are provided fllled with abrasives of different fineness so that Examples of materials which may be used for the body member are brass, bronze and copper.

It will be understood that the body member i may be provided with a tang fitting into a. handle orthe kind usually employed in the sharpening devices known as steels.

The invention will now be described in greater detail by way of example with reference to the 1 accompanying drawing, in which:

Fig. 1 is an elevation of a sharpening device according to the invention.

Fig. 2 is a section on the line AA of Fig. 1,

and

Fig. 3 is a similar sectional view of the body member before the filling of the grooves with the I abrasive.

Referring to the drawing, the sharpening device consists of a body member I of brass or other suitable soft material having four grooves, 2, 3,

and 6, filled respectively with masses containing silicon carbide or other suitable abrasive 8, I, 8 and i, the grains of abrasive in the masses 8 and 8 being substantially coarser than those in masses 1 and 9. The body member I is provided with a tang i0 fitting into a handle ii.

I claim:

1. Adevice for sharpening carvingknives comprising a brass body of rod-like form having four longitudinal grooves therein, a mass containing silicon carbide or other suitable abrasive bonded to the surface of each of said grooves, the granular size of the abrasive in two of said grooves diametrically oposed to each other being greater than the granular size of the abrasive in the other two grooves and the surfaces of the masses projecting beyond the surface of the body 

